September weather forecast
Hiriwadunna, Sri Lanka

September, the first month of the autumn in Hiriwadunna, is still a tropical month, with an average temperature fluctuating between 33.9°C (93°F) and 24.1°C (75.4°F).

Temperature

Hiriwadunna, Sri Lanka, records an average high-temperature of a still hot 33.9°C (93°F) in September, closely mirroring the climate of the previous month. During the nights in September, Hiriwadunna experiences a consistent average temperature of 24.1°C (75.4°F).

Heat index

The heat index value during September is appraised at a burning hot 45°C (113°F). Careful: Heat exhaustion and heat cramps are anticipated. With ongoing exertion, heatstroke becomes a possibility.
Know that the heat index computations account for shaded terrains and slight winds. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'apparent temperature' or 'real feel', unifies temperature and humidity readings to offer a comprehensive feel of warmth. Metabolic differences, pregnancy status, and the level of physical activity are additional factors influencing an individual's weather perception. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
The body's self-cooling mechanism is rooted in perspiration, where evaporating sweat cools down excessive warmth. In situations of high air temperature combined with high humidity (significant heat index), the body's ability to perspire is reduced, heightening the sense of warmth. Overheating risks increase with rising body temperatures, especially if heat release isn't efficient.

Humidity

The months with the lowest humidity are June through September, with an average relative humidity of 67%.

Rainfall

In Hiriwadunna, in September, it is raining for 13.5 days, with typically 53mm (2.09") of accumulated precipitation. In Hiriwadunna, Sri Lanka, during the entire year, the rain falls for 196.8 days and collects up to 943mm (37.13") of precipitation.

Daylight

The average length of the day in September is 12h and 10min.
On the first day of the month, sunrise is at 05:58 and sunset at 18:14. On the last day of September, in Hiriwadunna, sunrise is at 05:55 and sunset at 17:58 +0530.

Sunshine

In September, the average sunshine in Hiriwadunna, Sri Lanka, is 10.9h.

UV index

February through October, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for the average person.
Note: The UV index of 7 during September leads to these advisories:
Avoid overexposure. Fair-skinned individuals can burn in under 20 minutes. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.